What will happen if the user inputs a non-numeric value when using int() to convert the input?

If the user inputs a non-numeric value and you try to convert it to an integer using the int() function, Python will raise a ValueError. This error occurs because the input cannot be interpreted as an integer.

age = input("Enter your age: ")
try:
    age = int(age)  # Raises ValueError if input is not a valid integer
except ValueError:
    print("Please enter a valid number.")

Handling such errors with try-except blocks is important for making your program robust and user-friendly, ensuring it can handle invalid input gracefully.

Being aware of potential errors like ValueError helps you write more reliable code that anticipates and manages user input errors effectively.